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【单选题】
信号阀应安装在水流指示器前的管道上，与水流指示器之间的距离不宜小于（）mm。A.
100
B.
200
C.
300
D.
400
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皮皮学刷刷变学霸
举一反三
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A.
how to make dresses
B.
how dresses to make
C.
how to be made dresses
D.
how dresses to be made
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A.
He clashed with a group of nobles.
B.
He was unable to accept any challenge to his authority.
C.
He seized the inheritance left to his cousin
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【单选题】What is the main idea of this passage?
A.
How green plants make food.
B.
How green plants make sugar.
C.
How green plants get their energy.
D.
How green plants change sugar into starc
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